GOG.com announces they are now offering Ultima 4: Quest of the Avatar, the fourth installment in Lord British's Ultima series of RPGs, saying this is available at no charge. This game has an unusual background, as it was an intentional departure from some of the amoral mechanics of previous games in the series and genre. Here's a bit from MobyGames:

Instead of building up a character by any means possible in order to face a villain in the end of the game, in Ultima IV the player is trying to become the Avatar, a role model for people. This means upholding the Eight Virtues, basically trying to become a better person. Making morally conscious decisions and helping other people is not done expecting a material reward, but because it is the actual goal of the game and the main focus of its gameplay. The game frowns on behavior typical of most other RPGs, such as backstabbing fleeing enemies or picking up everything that isn't nailed down even if it does not belong to the protagonist. This different approach established the game's reputation as the first "true" Ultima, influencing the design philosophy of later installments and the overall spirit of the series.

Go to town, find healer, ask him to cure you for 100g. That's about the extent of my knowledge. I can't find a keyboard command list, but I haven't looked very closely at the manual (which appears to just be the history).